D benchmark code review

[Andrej Mitrovic]

On 12/15/13, Manu <turkeyman at gmail.com> wrote:
> I only worry about the garbage collector. Audio processing is my biggest
> fear case when there is a GC involved that is known to execute
> unpredictably, often taking a very long time in the rare event it does
> execute.

I think this is supposed to fix (or help fix) that problem:
https://github.com/D-Programming-Language/druntime/pull/493